Video camera mounting on the headrests gives plenty of room for a few cameras and shows enough of the dash for context. But obviously the rear view mirror has to go. Split the clamshells apart to first release point using the smaller blade of a 2 blade serious screwdriver (you will need the torque). Then use the larger blade to fully separate. Then turn the mirror in either direction as far as it will go. Then turn further using max force and the 3 point mount will release as in a collision. Press release on wire connector and stuff wire up under roof liner. Now you have as full a camera view of the outdoors as you could hope for while allowing inclusion of driver or just part of the dash/sun visors. Bar is 36 inch steel 1-1/2 slot angle. Used two 12 ga self-tapping screws into the plastic seat back. Video is very steady and watchable even on this rutted dirt road. A few inches should be trimmed off this bar; 32 inches is all that were needed.
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